钢结构方管的常见种类有哪几种1.轻钢结构，就是把彩钢板作为屋面和墙面，把薄壁型钢作为檩条和圈梁，并将焊接H型钢截面作为主和梁的一种结构，其连接则是采用螺栓连接或是焊接。轻型钢结构通常采用Q345方管和Q235方管，且大部分是Q345方管。Q…

方管价格偏弱运行。期螺今日早市横盘，午市新低3880点，多空进入空窗观望期；现货原料唐山窄带主稳报3900多成交不畅个别出清日产，部分盘中 降20报3880元含税出厂，285-355系列瑞丰散户下行，现货裸价主流3580-3650，期货3595-3600；河北主导管厂镀锌方管出厂报价中 午前后部分下调10-20，现方管4寸(3.75mm)出厂报价在4150-4260之间，1.5寸等部分规格继续优惠，唐山当地市场价4100元。市场 方面，华东、华南贸易商整体调整意愿不强，8月限产文件没有下达，盼涨但成交弱。另，今晨钢坯现货3700左右含税出库部分成交，预计午后坯降20左右。 预计镀锌方管市场价格将灵活偏弱。

The square tube price is running weakly. Futures snails are trading at a low of 3880 points in the morning and entering an empty window waiting period at noon. Tangshan narrow-band raw materials are reported to be more than 3900 barely traded, and some of them are reduced by 20 to 3880 yuan including tax. Ruifeng retailers of 285-355 series are down. Spot bare prices are mainstream 3580-3650, futures are 3595-3600; Hebei leading pipe plants are plated. The quotation of zinc square pipe was partially lowered by 10-20 around noon. The quotation of 4 inch square pipe (3.75mm) is between 4150-4260. Some specifications, such as 1.5 inch, continue to be preferential. The local market price of Tangshan is 4100 yuan. On the market side, the traders in East and South China are not willing to adjust as a whole. The production limit documents in August have not been issued. They are looking forward to rising but trading is weak. In addition, this morning about 3700 billet spot, including tax discharged part of the transaction, is expected to fall about 20 billets in the afternoon. It is expected that the market price of galvanized square tubes will be flexible and weak. 方管价格方面：国内重点城市4寸(3.75mm)方管的平均价格为4336，较前降10元；其中唐山、成 都降20，天津降60元。

As for the price of square tubes, the average price of 4-inch square tubes in key cities in China is 4336, 10 yuan lower than the previous price, including 20 yuan lower in Tangshan, Chengdu and 60 yuan lower in Tianjin.

　　国内方管或将继续趋弱整理厂家操作以出货为主方管价格持稳运行，今日方管主流企业持稳运行，原料方面：昌黎部分钢坯公布12月31日--1月2日早上钢坯执行结算价3300；下游管厂逐渐停工，因此方管市场高价成交 低迷，下游方管厂家观望意图明显。午后部分带方管厂家逐…